Help attaching in-line fan to carbon can filter

First, how in the world do you attach the flange to the can filter 2600? Do you have drill holes in it and the metal part of the filter and bolt it on? And then after that, how do you attach the flange to the fan? It doesn't seem like it'll fit directly onto the fan, or it's a really tight fit. Or do I have to use ducting?

I figured it out!

with mine i had a 4in coming from my box, i attached a 4 in duct to it and my filter is 6in so i got a connector for a 4in to a 6in then duct taped it to secure. get reflective tape. home depot has connector pieces. like a puzzle keep connecting til it fits.